linux-kernel - Re: [PATCH] x86/mce: fix a wrong assignment of i

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Message-ID: <20200611183647.GA255402@yaz-nikka.amd.com>
Date:   Thu, 11 Jun 2020 13:36:47 -0500
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Zhenzhong Duan <zhenzhong.duan@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH] x86/mce: fix a wrong assignment of i_mce.status

On Thu, Jun 11, 2020 at 12:55:00PM -0400, Luck, Tony wrote:
> +Yazen
> 
> On Thu, Jun 11, 2020 at 10:32:38AM +0800, Zhenzhong Duan wrote:
> > The original code is a nop as i_mce.status is or'ed with part of itself,
> > fix it.
> > 
> > Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...il.com>
> > ---
> >  arch/x86/kernel/cpu/mce/inject.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/kernel/cpu/mce/inject.c b/arch/x86/kernel/cpu/mce/inject.c
> > index 3413b41..dc28a61 100644
> > --- a/arch/x86/kernel/cpu/mce/inject.c
> > +++ b/arch/x86/kernel/cpu/mce/inject.c
> > @@ -511,7 +511,7 @@ static void do_inject(void)
> >  	 */
> >  	if (inj_type == DFR_INT_INJ) {
> >  		i_mce.status |= MCI_STATUS_DEFERRED;
> > -		i_mce.status |= (i_mce.status & ~MCI_STATUS_UC);
> > +		i_mce.status &= ~MCI_STATUS_UC;
> 
> Boris: "git blame" says you wrote this code. Patch looks right (in
> that it makes the code do what the comment just above says it is trying
> to do):
> 
>          * - MCx_STATUS[UC] cleared: deferred errors are _not_ UC
> 
> But this is AMD specific, so I'll defer judgement
>

Acked-by: Yazen Ghannam <yazen.ghannam@....com>

Thanks,
Yazen